Question:
I'm new to ubuntu, so I can't figure out why the port is not opening and how to do it anyway. Tell me please!
I tried to open the port in iptables, but as I understand it, iptables is used to manage the ufw firewall, and when I enter the sudo ufw status I get the answer:
sudo: ufw: command not foundHow to open the port in this case? Google advised me only iptables.
Just in case, I will give the output of the netstat -an | grep LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:953 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:587 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:80 0.0.0.0:* LISTENtcp 0 0 5.231.61.235:53 0.0.0.0:* LISTENtcp 0 0 127.0.0.2:53 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:53 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:22 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:631 0.0.0.0:* LISTENtcp6 0 0 ::1:953 :::* LISTENtcp6 0 0 :::53 :::* LISTENtcp6 0 0 :::22 :::* LISTENtcp6 0 0 ::1:631 :::* LISTENunix 2 [ ACC ] STREAM LISTENING 3215411995 /var/run/cups/cups.sockunix 2 [ ACC ] STREAM LISTENING 3215409707 /var/run/avahi-daemon/socketunix 2 [ ACC ] STREAM LISTENING 3215403381 @/com/ubuntu/upstartunix 2 [ ACC ] STREAM LISTENING 3215406175 /var/run/dbus/system_bus_socketunix 2 [ ACC ] STREAM LISTENING 3215553140 /var/run/sendmail/mta/smcontrolunix 2 [ ACC ] STREAM LISTENING 3215421071 /var/run/acpid.socketunix 2 [ ACC ] SEQPACKET LISTENING 3215405745 /run/udev/controlunix 2 [ ACC ] STREAM LISTENING 3215427067 /var/run/saslauthd/muxThat is, it seems like the 53rd port is open … How else to open ports?
Answer:
Your listing is not open ports, but the output of who is listening to which ports.
If you want to open port 53 over tcp, for example, using the iptables utility:
iptables -I INPUT -p tcp -m tcp --dport 53 -j ACCEPT